Most of them, you just have to type or paste your blog URL to get the page speed results. A couple of them, you have to sign up for a free account.
https://developers.google.com/speed/pagespeed/insights/
PINGDOM
https://tools.pingdom.com/fpt/
WEBPAGETEST
https://www.webpagetest.org/
GTMETRIX
https://gtmetrix.com/
LOAD IMPACT
https://loadimpact.com/
Rigor
https://rigor.com/free
Note: To improve or increase your website loading time, you can find lots of free tips over here.